28119 Parallax Inc, 28119 Datasheet - Page 108

• Manufacturer Part Number: 28119
• Description: KIT UNDERSTANDING SIGNALS
• Manufacturer: Parallax Inc

Specifications of 28119

• Lead Free Status: Contains lead
• Accessory Type: Oscilloscope
• Interface Type: USB
• For Use With/related Products: BASIC Stamp® 2 and Board of Education
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

example, if Vcc = 5 V and Vee = GND, a rail-to-rail op-amp could create an output
signal as large as 0 V to 5 Vs.
The LM358 found in the Understanding Signals kit is not a rail-to-rail op-amp. The
LM358 output range is Vcc – 1.5 and Vee + 20m V. With supply voltages of 5 V on Vcc
and ground on Vee, the output will only swing from 20m V to 3.5 V. Therefore, the
output signal waveform can not exceed 3.5 V and the waveform’s peaks appear to be
flattened out. Such a signal is said to be clipped, as shown in Figure 8-2.
GND
GND
3.5V
5V
5V
An LM358 circuit can be configured for an output swing larger than this in other applications
by adjusting the Vcc and/or Vee supply rails as needed. To check the maximum voltage you
can
httphttp://www.national.com/pf/LM/LM358.html.
LM358, Vcc=5V,
Vee=GND
apply
to
OPAMP OUTPUT
the
INPUT SIGNAL
LM358,
check
the
datasheet,
available
Figure 8-2:
LM358 Output
ranges from 20
mV to 3.5 V
Note that the
output signal is
clipping at the
LM358’s maximum
voltage of 3.5 V.
online
from